Certain acyl derivatives of the antibiotic t-2636c

ABSTRACT

Acyl derivatives of Antibiotic T-2636C useful for inhibiting the growth of Gram positive bacteria and being effective against strains resistant to Oleandomycin and Erythromycin, and method for production thereof.

United States Patent 1 3,691,181

Kishi et al. 1 Sept. 12, 1972 CERTAIN ACYL DERIVATIVES OF [56] References Cited THE ANTIBIOTIC T-2636C UNITED STATES PATENTS [72] Inventors: Toyokazu Kishi, Nara; Setsuo H Komei Mizuno both f 3,321,484 5/1967 Krimmel ..260/295.5 Osaka; Eiji Higashide Hyogo; Motoo Shibata, Osaka, all Bf Japan OTHER PUBLICATIONS Roberts et 111., Basic Principles of Organic Chemistry, [73] Assgnee' gg fifi gi i' glgf Benjamin Publishers, pages 530- 531, (1965) OD 251 R 58 C.6 [22] Filed: Oct. 27, 1969 Primary Examiner-Alan L. Rotman [21] Appl' 869864 Attorney-Wenderoth, Lind & Ponack [30] Foreign Application Priority Data [57] ABSTRACT Oct. 26, Japan derivatives of Antibiotic useful for inhibiting the growth of Gram positive bacteria and U-Su Cl.

P being efiective against strains resistant to Oleando- [5] Int. Cl C0" 31/36 C mycin and Erythromycin, and method for production th f [58] Field of Search "260/2955 P, 343.5 v mo l8 Claims, No Drawings CERTAIN ACYL DERIVATIVES OF THE ANTIBIOTIC T-2636C rochei var. volubilis, and can be recovered in good yield from the cultured broth (cf. Belgian Pat. No. 715,356). Further study of this new antibiotic by the present in ventors has given the following results:

l. The chemical structure of the antibiotic T-2636C v (hereinafter often referred to as C) is as shown in the formula I 2. antibiotic having a hydroxy group at each of positions 8 and I4;

20 therefore mono or diacyl derivatives of T-2636C are obtainable according to particular reaction conditions;

30 the acyl derivatives of T-2636C can be recovered in desired purity by chromatography or other per se conventional means; and

4. thus obtained acyl derivatives of T-2636C show improved therapeutic effect.

This invention is the culmination of the above findings and relates to pharmaceutically useful acyl derivatives of antibiotic T-2636C, which is acylated at position 14 or 8 and a method for producing them (hereinafter, the acyl derivatives of T-2636C are often referred to simply as C-( 8 or 14) acyl derivatives") The C-8 or 14 acyl derivative are produced by reacting C with a molecular equivalent of an acylating agent containing an acyl group and recovering said derivatives.

The term acyl group refers to an organic carboxylic acid residue which may, for example, be derived from an organic carboxylic acid R-COOl-l and is represented by the general formula R-CO- wherein R is hydrogen, alkyl of one to five carbon atoms or alkenyl of up to five carbon atoms, both optionally substituted by carboxy or halogen groups, aryl of six to nine carbon atoms, optionally substituted by halogen, pryidino, optionally substituted by halogen, aralkyl of seven to 10 carbon atoms, optionally substituted by halogen, and pyridino substituted by alkyl of one to five carbon atoms, and optionally substituted by halogen.

The C-8 or 14 acyl derivatives are exemplified by the following compounds:

T-2636C l4 propionate T-2636C l4 butyrate T-2636C l4 valerate T-2636C l4 crotonate T-2636C l4 nicotinate T-2636C l4 benzoate T-2636C l4 p-propyl-benzoate T-2636C l4 phenylpropionate T-2636C l4 phenylvalerate T-2636C 8 formate T-2636C 8 acetate T-2636C 8 trifluoro-acetate T-2636C 8 propionate T-2636C 8 valerate T- 2636C 8 crotonate T-2636C 8 benzoate T-2636C 8 p-propyl-benzoate T-2636C 8 m-bromo-benzoate T-2636C 8 phenylpropionate T-2636C 8 phenylvalerate The simplest acylating agent is an acid but acid halides and acid anhydrides can also be employed.

When using such acylating agent, it is desirable to conduct the reaction in the presence of a common organic solvent which will not adversely affect the acylation, such as pyridine, tetrahydrofuran, acetone, ether or a mixture of such solvents.

Introduction of 'acyl groups may be carried out by direct condensation with an acylating agent in the presence or in the absence of a condensing agent such as trifluoroacetic anhydride.

The reaction is usually carried out at room temperature, but it may also be carried out at about 0 C or at an elevated temperature, for about 1 to 50 hrs.

C-8 or l4-acyl derivatives can also be produced by firstly obtaining C-8, l4-diacyl derivatives and then subjecting the diacyl derivatives to partial hydrolysis.

Whereas the C-8, l4-diacyl derivatives are produced by introducing into the hydroxy] groups at positions 14 and 8 of T-2636C an acylating agent containing acyl groups in one or two steps and the two acyl groups are the same or different from each other, the partial hydrolysis is carried out by dissolving the above produced diacyl derivatives in a suitable solvent and treating the solution with an acid or alkali or by contacting it with an adsorbent material (e.g. silica gel or alumina).

With an adsorbent material the hydrolysis occurs by making use of the humidity in the air or a small amount of water contained in the solvent or adsorbent material.,

The reaction may be carried out at room temperature or at a lowered or an elevated temperature for several minutes to a few days. v Similarly C-8 or l4-acyl derivatives can be prepared in good yield by the steps of dissolving C diacyl derivatives in a suitable water-soluble organic solvent, contacting the mixture with the acetone powder or crude enzyme preparation obtained from the mycelia or culture filtrate of the antibiotic T-2636C-producing strain, the culture of the strain or the residual liquor after extraction of T-2636C from the cultured broth, and allowing the mixture to stand for a certain period of time.

The T-2636C-producing strain may be, for example, Slreptomyces rochei var. volubilis, a culture of which has been deposited at American Type Culture Collection, Rockville, Md., U.S.A. under the accession number ATCC-21250 the morphological and cultural characteristics of this strain are disclosed in US. Pat. No. application Ser. No. 730,1l3, filed May 17, 1968, now US. Pat. No. 3,626,055 dated Dec. 7, i971.

upon concentration of the reaction mixture or addition of water.

The C acyl derivatives are usually obtained in the reaction system as a mixture of C-l4-acyl derivatives, C-8-acyl derivatives and C-8, l4-diacyl derivatives and, if required, it is possible to recover each component in the desired purity by first allowing the mixture to precipitate and then subjecting the precipitates to chromatography or other per se conventional purifiaction means.

The position of acylation of the various C acyl derivatives obtainable according to this invention can be confirmed from their characteristic absorption bands in the hydroxyl region of the infrared spectrum as well as from the shift of the methin protons, to which the acylated hydroxy radical(s) is attached, in the nuclear magnetic resonance (NMR) spectrum (100 MC, CDCl as will be seen from the following Table I.

(vOH) The objective T-2636C acyl derivatives show improved biological activities and therapeutic effect, inhibiting the growth of Gram positive bacteria both in vitro and in vivo and being effective against strains resistant to Oleandomycin and Erhthromycin. The T-2636C acyl derivatives may be used for the treatment of various infections of Gram positive bacteria by injection or by oral administration. ln general, the dosage of the T-2636C acyl derivatives is 5002,000 milligrams per day for man.

Presently-preferred embodiments of the invention are shown in the following examples, but are not intended to be construed as limiting the present invention.

In the following examples, parts by weight bear the same relation to parts by volume as do gram(s) to milliliter(s).

EXAMPLE 1 (Production of C-8, l4-diacetate, C-l4-acetate and C- 8-acetate) 1. In 10 parts by volume of pyridine is dissolved 0.92 part by weight of C, followed by the addition of 0.22 part by volume of acetic anhydride. The mixture is allowed to stand at room temperature for 7 hrs., at the end of which time it is poured into ice water.

The resulting precipitates are recovered by filtation. The procedure yields 1 part by weight of crude substance. This product is column-chromatographed on 30 parts by weight of silica gel (0.05 to 0.20 mm, Merck) and fractionated into four components with use of a benzene-ethyl acetate solvent system.

On the thin layer chromatogram of the above product [benzenezethyl acetate (2:1 the above silica gel], the four components are detected at Rf values of 0.53, 0.29, 0.15 and 0.05, respectively. They correspond to C-8, l4-diacetate, C-l4-acetate, C-8- acetate and C, respectively.

The portion other than the fractions isolated as above is further subjected to thin layer chromatography on the above silica gel and the separated fractions are combined with the fractions obtained by column-chromatography.

The mixture is allowed to crystallize. The procedure yields 0.175 part by weight of C-8, l4-diacetate, 0.097 part by weight of C-l4-acetate and 0.087 part by weight of C-8-acetate.

2. In a mixture of 0.5 part of volume of pyridine and 2 parts by volume of tetrahydrofuran is dissolved 0.23 part by weight of C, followed by the addition of a solution of 0.25 part by volume of acetyl chloride in 4 parts V by volume of tetrahydrofuran at 0 C under stirring.

The mixture is allowed to react for 1 hr. The reaction product is separated by thin-layer chromatography and allowed to crystallize, whereupon 0.032 part by weight of C-l4-acetate (m.p. 207 to 210 C) [hereinafter melting points indicate decomposition points] and 0.034 part by weight of C-8-acetate (m.p. 201 to 202 C) are obtained.

3. In a mixture of 0.2 part by volume of pyridine and 0.8 part by volume of tetrahydrofuran is dissolved 0.23 part by weight of C, followed by the addition of 0.03 part by volume of acetic anhydride. The mixture is allowed to react at room temperature for 5 hours. The result is almost the same as in (2).

Elementary analysis (C H NO Calculated: C, 64.65; H, 7.03; N, 2.79 Found: C- l 4-acetate C, 64.61; H, 7.00, N, 2.75 C-S-acetate C, 64.62; H, 7.31; N, 2.83

C l 4-acetate C-8-acetate [a] 23S(C=l.0, EtOH) 2l8(C=0.5, EtOH) Ultraviolet absorption A f =227 mn A,,,,,,""' 226 my spectrum hereinafter referred to as UV EXAMPLE 2 (Production of C-14-acetate, C-8-acetate and C-8, 14- diacetate) In 50 parts by volume of tetrahydrofuran is dissolved 0.23 part by weight of C, followed by the addition of 0.1 part by volume of acetic acid and 0.1 part by volume of trifluoroacetic anhydride. The mixture is refluxed for 3 hrs., at the end of which time it is concentrated under reduced pressure. The concentrate is poured into water and extracted twice with 50 parts by volume each of ethyl acetate.

The extract is sufficiently washed with parts by volume of water, dehydrated and concentrated under reduced pressure. The concentrate is subjected to thinlayer chromatography on silica gel (HF 254) to separate 0.045 part by weight of C-l4-acetate, 0.07 part by weight of C-S-acetate, and 0.02 part by weight of C-8, 14-diacetate.

EXAMPLE 3 (Production of C-8,14-dipropionate, C-l4-propionate, and C-8-propionate) In 10 parts by volume of pyridine is dissolved 0.92 part by weight of C, and 0.25 part by volume of propionic anhydride is added.

The mixture is allowed to stand at room temperature for 7 hrs., at the end of which time it is treated in the same manner as in Example 1 (1). The above procedure yields 0.138 part by weight of C-8,14- dipropionate, 0.138 part by weight of C-14-propionate (m.p. 197 C) and 0.131 part by weight of C-8- propionate (m.p. 203 to 204 C), as colorless crystals. Elementary analysis C l-13 N092 Calculated: C, 65.23; H, 7.23; N, 2.72

Found: C- l 4-propionate C, 65.00; H, 7.27; N, 2.76 C-8-propionate' C, 64.77; H, 7.26; N, 2.77

EXAMPLE4 (Production of C-8, l4-dicrotonate, C-14-crotonate and C-8-crotonate) In 10 parts by volume of pyridine is dissolved 0.92 part by weight of C, and 0.33 part by volume of crotonic anhydride is added.

The mixture is allowed to stand at room temperature for 17 hrs., at the end of which time it is treated in the same manner as in Example 1 1 The procedure yields, as colorless crystals, 0.073. part by weight of C-8,14-dicrotonate, 0.124 part by weight of C-l4-crotonate (m.p. 196 C), and 0.075 part by weight of C-8-crotonate (m.p. 198 to 200 C). Elementary analysis C 1-1 NO Calculated: C, 66.02; H, 7.07; N, 2.65

Found: C- l4-crotonate C, 65.77; H, 7.30; N, 2.69 C-8-crotonate C, 66.16; H, 6.40; N, 2.63

C- l4-crotonate C-8-crotonate -167 c=o.5. EtOH) emu 22 m (E 1110) EXAMPLE 5 1n 1 part by volume of pyridine is dissolved 0.09 part by weight of C, followed by the addition of 0.1 1 part by volume of m-bromo benzoyl chloride. The resulting mixture is allowed to standat room temperature for 15 hrs. The reaction mixture is poured into ice-water and the precipitates are recovered by filtration. The precipitates are then subjected to thin layer chromatography on silica gel HF 254 (above mentioned) [solvent system-benzene: ethyl acetate (2:1)] and the effective ingredient is allowed to separate from n-hexane. The procedure yields 0.028 part by weight of pale-yellowish powder of C-8-(m-bromo) benzoate. Elementary analysis C 1-1 NO Br):

Calculated: C, 59.82; H, 5.65; N, 2.18

Found: C, 60.10; H, 5.85; N, 2.02 [ad -663 C=0.32, EtOl'l) UV A s-mu 2 m EXAMPLE 6 (Production of C-8-benzoate and C-14-benzoate) 1n 10 parts by volume of pyridine is dissolved 0.92 part by weight'of C, followed by addition of 0.542 part by weight of benzoic anhydride. I

The mixture is allowed to stand for the 15 hrs. at room temperature, at the end of which time the reaction mixture is poured into ice water to give precipitates. The precipitates are extracted with 300 parts by volume of ethyl acetate. The extract is washed with dil. HCl, dil. Nal-lCO and water in that order and dried with sodium sulfate anhydride, followed by concentration and thin layer chromatography on silica gel HE 254, [solvent system-benzenezethyl acetate (2:1

These procedures yield 0.079 part by weight of C- 1 4- benzoate (m.p. 186 to 188 C) and 0.052 part by weight of C-8-benzoate (m.p. 203 to 206 C). Elementary Analysis (C l-1 NO (C-14-benzoate Calculated: C, 68.19; H, 6.62; N, 2.49

Found: C, 67.92; H, 6.51; N, 2.60 [a] =90.2 (C=0.5, EtOl-l) UV: A 227.5 mp. (E cm% 933) EXAMPLE 7 (Production of C-8-phenylpropionate and C-14-phenylpropionate) In 10 parts by volume of pyridine is dissolved 0.92 part by weight of C, followed by addition of 0.5 part by volume of phenylpropionyl chloride.

The mixture is allowed to stand at room temperature for 15 hrs, at the end of which time the reaction mixture is poured into ice water to give precipitates. The precipitates are filtered, washed and chromatographed on 30 parts by weight of silica gel (0.05 to 0.2 mm, Merck) to obtain two components which are subjected to further purification procedure with silica gel chromatography.

These procedures yield 0.085 part by weight of C- 1 4- phenylpripionate and 0.097 part by weight of C-8- phenyl-propionate.

C-S-phenylpropionate H.698; N,2.37 Found C.69.69; H,6.99; N,2.31 C.68.86;

H.684; N,2.37 61, 157.2(C=0.5, EtOH) 140.2(C=0.5. EtOH) x,,,,. 227 m 226 m EXAMPLE 8 (Production of C- 1 4-nicotinate) in a mixture of parts by volume of tetrahydrofuran and 2 parts by volume of pyridine are dissolved 0.92 part by weight of C and 0.5 part by weight of nicotinyl chloride hydrochloride and the mixture is kept standing at room temperature for hrs. To the reaction mixture is added 300 parts by volume of ethyl acetate and 150 parts by volume of water, and after separating theethyl acetate layer, the aqueous layer is adjusted to-pl-l 7 and extracted with ethyl acetate. The extract is washed under ice cooling with water, and after drying with anhydrous sodium sulfate, chromatographed on parts by weight of silica gel (0.05 to 0.2 mm, Merck). The eluate with a mixed solution of benzene-ethyl acetate (5:5 to 2:8) is concentrated.

The concentrate is subjected to thin layer chromatography on 320 parts by weight of silica gel [solvent system-benzenezethyl acetate ((1:2)] to give 0.094 part by weight of C-l4-nicotinate [m.p. 185 to 187 C].

Elementary Analysis (C ,H,, N O,,):

Calculated: C, 65.94; H, 6.43; N, 4.96

Found: C, 65.51; H. 6.51; N, 4.55 [a],, =-93.6 (C 0.409,EtOH) EXAMPLE 9 (Production of C-8, 14-diacetate a 1 In a mixture of 0.5 part by volume of pyridine and 2 parts by volume of tetrahydrofuran is dissolved 0.23 part by weight of C and while the solution is cooled with ice-water under stirring, a solution of 0. l 5 part by volume of acetyl chloride in 8 parts by volume of tetrahydrofuran is gradually added thereto, and the mixture is allowed to stand for 1 hr.

Then, the reaction mixture is poured into ice water. The. precipitates are recovered by filtration and recrystallized from a mixture of n-hexane and ethyl acetate, whereupon 0.21 part by weight of crystals of C-8. 1 4-diacetate is obtained.

2 In a mixture of 0.5 part by volume of pyridine and 2.0 parts by volume of tetrahydrofuran is dissolved 0.23 part by weight of C, followed by the addition of 0.5 part by volume of acetic anhydride.

The mixture is allowed to stand at room temperature for 15 hrs.

The reaction product is treated in the same manner as in (1) and, then, recrystallized from ether. The procedure yields 0.18 part by weight of pure crystals of C-8, l4-diacetate (m.p. 136 to 140C). Elementary analysis (C H ,NO,,):

Calculated: C, 64.07; H, 6.86; N, 2.58

Found: C, 63.77; H, 6.89; N, 2.74 [a],,=21l(C=0.5, EtOH) EXAMPLE l0 (Production of C-8, l4diacetate) and recrystallized from a mixture of ether and n-hexane.

The procedure yields 0.08 part by weight of colorless prisms of C-8, l4-diacetate EXAMPLE 11 (Production of C-8, 14-dipropionate) I In 5 parts by volume of pyridine is dissolved 0.23 part by weight of C, followed by the addition of 1.04 part by volume of propionic anhydride. The mixture is allowed to stand at 0 C for 48 hrs., at the end of which time the reaction mixture is poured into ice water. The resulting precipitates are recovered by filtration and recrystal lized from either n-hexane.

The procedure yields 0.23 part by weight of colorless crystals of C-8, l4-dipropionate (m.p. to 186 C). Elementary analysis (C ,H,,NO,,):

Calculated: C, 65.13; H, 7.23; N, 2.45

Found: C, 64.98; H, 7.20; N, 2.38 [a],,=206 (C=0.5, EtOH) UV )t f 226 mu (E, 883) EXAMPLE 12 (Production of C-8, 14-dicrotonate) In 5 parts by volume of pyridine is dissolved 0.23 part by weight of C, followed by the addition of 1 part by volume of crotonic anhydride.

The mixture is allowed to stand at room temperature for 15 hrs., at the end of which time the reaction mixture is poured into ice water. The resulting precipitates are recovered by filtration and recrystallized from ether n-hexane, whereupon 0.23 part by weight of colorless crystals of C-8, 14-dicrotonate is obtained (m.p. 193 to 195 C).

Elementary analysis (C,, H,,,NO

Calculated: C, 66.54; H, 6.94; N, 2.35

Found: C, 66.21; H, 7.02; N, 2.31 [a],,=120 (C=0.5, EtOH) UV A,,,,,, 226 mpt (E, 1060) EXAMPLE 13 (Production of C-8, l4-disuccinate) 1n 4 parts by volume of pyridine is dissolved 0.23 part by weight of C, followed by the addition of 0.5 part by weight of succinic anhydride. The mixture is allowed to stand at 0 C for 15 hrs., at the end of which time it is poured into ice water.

The mixture is extracted with 200 parts by volume of ethyl acetate and the extract is washed with water and transferred to a 2 percent aqueous NaHCO solution under cooling. The solution is brought to pH 2 by the addition of 4N HCl and then extracted with 200 parts by volume of ethyl acetate.

The extract is washed with 50 parts by volume of water and dried over sodium sulfate, followed by concentration. The concentrate is allowed to crystallize from ethyl acetate-ether.

The procedure yields 0.05 part by weight of colorless needles (mp. 148 to 152 C).

Elementary analysis (C ,,H,,NO,,,):

Calculated: C, 60.08; H, 6.26; N, 2.12 Found: C, 59.99; H, 6.5 1; N, 2.51

[01],, =-210 (C 0.5, EtOH) EXAMPLE 14 (Production of C-8, 14-di( trifluoro)acetate) ln 10 parts by volume of tetrahydrofuran is dissolved 0.92 part by weight of C, followed by addition of 1.5 parts by volume of trifluoro acetic anhydride under ice cooling and the mixture is allowed to stand at room temperature under stirring for 2 hrs. The reaction mixture is poured into ice water to give precipitates, which are immediately extracted with 300 parts by volume of ether. The extract is washed with water, concentrated and kept standing at to C to crystallize.

The crystalls are recrystallized from ether to yield 0.75 part by weight of C-8, 14-di(trifluoro)acetate as colorless needles (m.p. 152 to 154 C). Elementary Analysis C H ,NO,,F,, Calculated: C, 53.46; H, 4.80; N, 2.15 Found: C, 53.49; H, 4.81; N, 2.17 [a],, =235 (C=0.854, CHCl UV h =227 mp.( E, 702) EXAMPLE 15 (Production of C- 1 4-acetyl-8-propionate) 1n 5 parts by volume of pyridine is dissolved 0.25 part EXAMPLE 16 (Production of C-14-acetyl-8-crotonate) ln 5 parts by volume of pyridine is dissolved 0.25 part by weight of C-14-acetate, followed by the addition of 0.31 part by volume of crotonic anhydride.

The mixture is allowed to stand at room temperature for 48 hrs., at the end of which time the reaction mixture is treated in the same manner as Example 10.

The procedure yields 0.173 part by weight of paleyellowish crystals of C-l4-acetyl-8-crotonate (m.p.

115 to 124 C).

Elementary analysis C ,H, NO,,

Calculated: C, 65.36; H, 6.90; N, 2.46 Found: C, 65.55; H, 7.24; N, 2.41

EXAMPLE 17 (Production of C- 14-acetyl-8-(m-bromo)benzoate) In 10 parts by volume of pyridine is dissolve 0.5 part by weight of C-14-acetate, followed by the addition of 0.28 part by weight of m-bromobenzoyl chloride. The

mixture is allowed to stand overnight at room temperature and the reaction mixture is poured into parts by volume of ice-water, whereupon 0.527 part by weight of precipitates is obtained.

The precipitates are dissolved in a small amount of ethyl acetate under heating and the solution is allowed to cool, whereupon crystals separate. The crystals are recrystallized from ethyl acetate to give 0.3 part by weight of colorless needles of C-14-acetyl-8-(mbromo) benzoate (m.p. 201 to 203 C).

Elementary analysis C;,,H,,,,NO,,Br

. Calculated: C, 59.65; H, 5.60; N, 2.05; Br, 11.67

Found: C, 59.95; H, 5.53; N, 1.96; Br, 11.75

EXAMPLE 18 (C- 14-propionyl-8-acetate) 1n 4 parts by volume of pyridine is dissolved 0.1 part by weight of C-8-acetate, followed by the addition of EXAMPLE 19 (Production of C-8-acetate) 1. In 250 parts by volume of methanol is dissolved 0.1 part by weight of C-8, 14-diacetate, followed by the addition of 750 parts by volume of Sbrensens phosphate buffer solution at pH 6.6. The mixture is held at 32 C and 10 parts by weight of the acetone powder sample prepared from the mycelia of Streptomyces rochei var. volubilis (ATCC 21250) is added. The mixture is allowed to stand for 2 hrs., at the end of which time it is filtered.

Water is added to the filtrate, followed by extraction with ethyl acetate.

The extract is washed with water and concentrated under reduced pressure.

From the concentrate, the effective ingredient is separated by thin layer chromatography onsilica gel.

It is allowed to crystallize from ether, whereupon 0.05 part by weight of colorless prisms is obtained.

From its infrared absorption spectrum, nuclear magnetic resonance spectrum, mixed melting point and other data, this product is identified as C-8-acetate.

2 ln 2,500 parts by volume of methanol is dissolved 10.8 parts by volume of C-8, 14-diacetate, and with stirring the solution is poured into 7,500 parts by volume of the residue liquor obtained after extraction of the culture of Streptomyces rochei var. volubilis (ATCC 21250) with ethyl acetate.

The mixture is allowed to stand at about 37 C for 1.5 hrs. The methanol is distilled off from the mixture are obtained. The crystals are further allowed to crystallize from ethyl acetate.

The procedure yields 7.9 parts by weight of C8- acetate (m.p. 201 to 202 C).

EXAMPLE 20 (Production of C-l4-acetate and C-8-acetate 1 In parts by volume of methanol is dissolved 0.1 part by weight of C-8, l4-diacetate and 2.5 parts by volume of 0.1 N HCl is added.

The resulting mixture is allowed to stand at room temperature for 60 hrs., at the end of which time water is added to the reaction mixture, followed by extraction with 100 parts by volume of ethyl acetate. The extract is washed with water and concentrated. i

The concentrate is subjected to silica gel chromatography for'separation and purification of the effective ingredient. V

The procedure yields 0025 part by weight of C-l4- acetate and 0.020 part by weight of C-S-acetate.

2 In 25 parts by volume of methanol is dissolved 0.1 part by weight of C-8, 14-diacetate, followed by the addition of 25 parts by volume of a 2 percent aqueous NaHCO solution. The mixture is stirred at room temperature for 30 minutes, at the end of which time it is treated in the same manner as in l The procedure yields 0.02 parts by weight of C-14- acetate and 0.015 part by weight of C-8-acetate.

EXAMPLE 21 (Production of C-8-(trifluoro)acetate) 0.86 part by weight of C-8, l4-di(trifluoro)acetate is chromatographed on 30 parts by weight of silica gel (0.05 to 0.2 mm, Merck) and eluted with a solvent system of benzene and ethyl acetate (7:3 to 6:4). The O8, l4-di(trifluoro)acetate di(trifiuoro)acetate is partially hydrolyzed on the surface of the silica gel.

The eluate is concentrated to give 0.27 part by weight of C-8-(trifiuoro)acetate as colorless prisms. (m.p. 150 to 153C).

Elementary analysis C H NO F Calculated: C, 58.37; H, 5.80; N, 2.52

Found: C, 58.53; H, 5.69; N, 2.89 [a] =-2l6.6( C=0.5 EtOl-l) EXAMPLE 22 (Production of C-8-propionate) In 200 parts by volume of water is dissolved 0.2 part by weight of a crude enzyme preparation obtained from the cultured broth of Streptomyces rochei var volubilis (ATCC 21250), to which is added 0.1 part by weight of C-14-acetyl-8-propionate dissolved in 40 parts by volume of methanol. The mixture is allowed to stand at 25 C under stirring for one hr., followed by extraction with 300 parts by volume of chloroform and 100 parts by volume of water.

The extract is concentrated and recrystallized from ethyl acetate-ether to give 0.08 part by weight of crystals, which is confirmed to be C-8-propionate by infrared spectrum, nuclear magnetic resonance spectrum and the Rf value determined by chromatography on silica gel.

EXAMPLE 23 (Production of C-8-crotonate) 0.1 part by weight of C-l4-acetyl-8-crotonate is treated in the same manner as in Example 210' give 0.075 part by weight of crystals, which is confirmed to be C-8-crotonate by infrared spectrum, nuclear magnetic resonance spectrum, and the Rf value determined by chromatography on silica gel.

EXAMPLE 24 (Production of C-8-benzoate) ln 1 part by volume of pyridine is dissolved 0.1 part by weight of C-l4-acetate and 0.2 part by weight of benzoic anhydride.

The mixture is allowed to stand at room temperature for 15 hrs. and poured into ice water to obtain precipitates.

The precipitates are collected, washed and dissolved in 10 parts by volume of methanol, to which is added 0.05 part by weight of crude enzyme preparation (referred to in Example 22) dissolved in 50 parts by volume of water, and the mixture is treated in the same I manner as in Example 22.

The obtained concentrate is chromatographed on silica gel HF 254 and eluted with a mixed solvent of benzene-ethyl acetate 1:1) to give 0.01 part by weight of crystals, which is confirmed to be C-8-benzoate by infrared spectrum, melting point and the Rf value determined by chromatography on silica gel.

What is claimed is: t i

'1. An acyl derivative of Antibiotic T-2636C of the formula wherein the acyl derivative is a member selected from the group consisting of a. a compound 1 having the hydrogen atom of the hydroxy group at position 14 replaced by R-CO and b. a compound 1 having the hydrogen atom at the hydroxyl group at position 8 replaced by RCO wherein R is (1) hydrogen, (2) alkyl of two to five carbon atoms in the case of compound (a) and one to five carbon atoms in the case of compound (b), optionally substituted by carboxyl or halogen, (3) alkenyl of up to five carbon atoms, (4) phenyl, optionally substituted by halogen, (5) pyridino and (6) aralkyl of seven to 10 carbon atoms.

2. The compound according to claim 1, namely T- 263 6C- 1 4-propionate.

3. The compound according to claim 1, namely T- 2636C- l 4-crotonate.

4. The compound according to claim 1, namely T- 2636C- l 4 nicotinate.

5. The compound according to claim 1, namely T- 2636C-l4-benzoate.

6. The compound according to claim 1, namely T- 2636C-l4-phenylpropionate.

7. The compound according to claim 1, namely T- 2636C-8-formate.

8. The compound according to claim 1, namely T- 2636C-8-acetate.

9. The compound according to claim 1, namely T- 2636C-8-trifluoroacetate.

10. The compound according to claim 1, namely T- 2636C-8-propionate. 

2. The compound according to claim 1, namely T-2636C-14-propionate.
 3. The compound according to claim 1, namely T-2636C-14-crotonate.
 4. The compound according to claim 1, namely T-2636C-14-nicotinate.
 5. The compound according to claim 1, namely T-2636C-14-benzoate.
 6. The compound according to claim 1, namely T-2636C-14-phenylpropionate.
 7. The compound according to claim 1, namely T-2636C-8-formate.
 8. The compound according to claim 1, namely T-2636C-8-acetate.
 9. The compound according to claim 1, namely T-2636C-8-trifluoroacetate.
 10. The compound according to claim 1, namely T-2636C-8-propionate.
 11. The compound according to claim 1, namely T-2636C8-crotonate.
 12. The compound according to claim 1, namely T-2636C-8-benzoate.
 13. The compound according to claim 1, namely T-2636-8-(m-bromo)benzoate.
 14. The compound according to claim 1, namely T-2636C-8-phenylpropionate.
 15. The compound according to claim 8, namely T-2636C-8, 14-disuccinate.
 16. The compound according to claim 1, namely, T-2636C-14-butyrate.
 17. The compound according to claim 1, namely, T-2636C-14-valerate.
 18. The compound according to claim 1, namely, T-2636C-8-valerate. 